Patterns of development of gonads, sex-drive and hormonal responses in tropical beef bulls

Perry, V.E.A.; Chenoweth, Peter J.; Post, T.B.; Munro, R. K.

doi:10.1016/0093-691x(91)90297-q

Cited by 24 publications

(8 citation statements)

References 21 publications

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“…The higher levels of spermatozoa with non-progressive motility, the overall increased numbers of morphologically abnormal spermatozoa and the tendency for lower concentrations suggest that both epididymal function and spermatogenesis were delayed or disrupted by the LPeri maternal diet. As expected in pubertal bulls, the initial high level of proximal droplets in ejaculates decreased over time (Lunstra and Echternkamp 1982;Barth and Oko 1989;Perry et al 1991;Evans et al 1995) but was not altered by in utero diet. Midpiece defects and abnormal heads and tails were increased in the LPeri bulls; both defects are reported to be associated with disturbance of epididymal function (Barth and Bowman 1994).…”

Section: Postnatal Developmentmentioning

confidence: 54%

“…The effects on sperm parameters were, however, subsequent to lower FSH concentrations in the LPeri cohort; FSH is an integral part of the hormonal cascade regulating sperm production (Perry et al 1991), epididymal function (Grover et al 2005) and spermatogenesis in the mature bull (Barth and Bowman 1994;Matsuzaki et al 2000;O'Shaughnessy 2014). In ruminants, no comparative studies have documented the associations between prenatal nutrition and sperm abnormalities in the progeny.…”

Section: Postnatal Developmentmentioning

confidence: 99%

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Peri-conception and first trimester diet modifies reproductive development in bulls

Copping

Ruiz-Diaz

Mongan

et al. 2018

Reprod. Fertil. Dev.

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Abstract. Nutritional perturbation during gestation alters male reproductive development in rodents and sheep. In cattle both the developmental trajectory of the feto-placental unit and its response to dietary perturbations is dissimilar to that of these species. This study examined the effects of dietary protein perturbation during the peri-conception and first trimester periods upon reproductive development in bulls. Nulliparous heifers (n ¼ 360) were individually fed a high-or low-protein diet (HPeri and LPeri) from 60 days before conception. From 24 until 98 days post conception, half of each treatment group changed to the alternative post-conception high-or low-protein diet (HPost and LPost) yielding four treatment groups in a 2 Â 2 factorial design. A subset of male fetuses (n ¼ 25) was excised at 98 days post conception and fetal testis development was assessed. Reproductive development of singleton male progeny (n ¼ 40) was assessed until slaughter at 598 days of age, when adult testicular cytology was evaluated. Low peri-conception diet delayed reproductive development: sperm quality was lowered during pubertal development with a concomitant delay in reaching puberty. These effects were subsequent to lower FSH concentrations at 330 and 438 days of age. In the fetus, the low periconception diet increased the proportion of seminiferous tubules and decreased blood vessel area in the testis, whereas low first trimester diet increased blood vessel number in the adult testis. We conclude that maternal dietary protein perturbation during conception and early gestation may alter male testis development and delay puberty in bulls.

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Section: Postnatal Developmentmentioning

confidence: 54%

Section: Postnatal Developmentmentioning

confidence: 99%

Peri-conception and first trimester diet modifies reproductive development in bulls

Copping

Ruiz-Diaz

Mongan

et al. 2018

Reprod. Fertil. Dev.

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“…The subsequent decline in FSH at 7 d corresponds with previously reported effects of glucocorticoids on gonadotropins (Chantaraprateep and Thibier, 1979). The episodic nature of FSH secretion in bulls (Perry et al, 1991), however, may mask a more direct relationship with cortisol than we were able to determine with once daily collection, with FSH concentrathe apparent peak in cortisol and trough in FSH concentration were matched by the peak in midpiece abnorinterval expected if testosterone levels were reduced in juncture (Vogler et al, 1993). A standardized reduction in testosterone in the OFF treatment group was present throughout the postchallenge period.…”

Section: Effects On Spermatogenesis and Circulating Hormonesmentioning

confidence: 99%

Subacute ruminal acidosis reduces sperm quality in beef bulls1

Callaghan

McAuliffe

Rodgers

et al. 2016

Journal of Animal Science

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk 3215 INTRODuCTIONBreeding bulls in Australia are commonly fed high-energy diets before sale, generally in the form of grain. These diets previously have been shown to negatively affect sperm quality in bulls (Coulter phenomenon has been associated with increased adipose tissue deposition in the scrotal neck, impairing thermoregulation via the pampiniform plexus (Kastelic et al., 1996). Elevation of testicular tem--duction and sperm viability (Vogler et al., 1993). However, anecdotal evidence from veterinary practitioners and semen morphology laboratories suggests that sperm production can be affected early in the sale preparation process, before fat deposition occurring (P. McAuliffe, personal communication). The rapid introduction of diets containing readily fermentable carbohydrates may precipitate ruminal acidosis AbSTRACT: Breeding bulls are commonly fed high-energy diets, which may induce subacute rumiGertrudis bulls (age 20 ± 6 mo) were used to evaluate the extent and duration of effects of SARA on semen quality and the associated changes in circulating hormones and metabolites. The bulls were relocated and fed in yards with unrestricted access to hay and daily individual concentrate feeding for 125 d before SARA challenge. Semen was collected and assessed at 14-d intervals before the challenge to ensure acclimatization and the attainment of a stable spermiogram. The challenge treatments consisted of either a single oral dose of oligofructose (OFF; 6.5 g/kg BW) or an equivalent sham dose of water (Control). Locomotion, behavior, respiratory rate, and cardiovascular and gastrointestinal function were intensively monitored during the retained for VFA, ammonia, and lactate analysis. After the challenge, semen was then collected every third day for a period of 7 wk and then once weekly until 12 wk, with associated blood collection for FSH, testosterone, inhibin, and cortisol assay. Percent normal sperm decreased in bulls dosed with OFF after the challenge period (P -lenge. There was a corresponding increase in sperm defects commencing from 16 d after challenge. These included proximal cytoplasmic droplets (P P = 0.01), and vacuole and teratoid heads (P -ity after challenge were associated with lower serum testosterone (P P cortisol in OFF bulls tended to be greater (P = 0.07) at 7 d after challenge. This study shows that SARA chalpreclude bulls from sale as single sire breeding animals 3 mo after the event occurred.

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“…Erkek darruzlıklann genç yaşta seçiminde ve darruzhk boğanın muhtemel sperma verimini tahmin etmede skrotal çevre uzunluğu ve testis ölçülerinin vazgeçilmez unsurlar olduklarını öne süren araştıncıların (9,20,27) görüşleri, elde edilen korelasyonlarla da desteklenmektedir (Tablo-6, 7, 8).…”

Section: Bulgularunclassified

“…Skrotal çevre uzunluğu, yaşa (5,11,25), ırka (4, 2l) ve ortalama canlı ağır-lık artışına (20) bağlı olarak değişmektedir.…”

Section: Introductionunclassified

DEGİşİK IRKTAN DAMIZLIK BOGALARDA ANDROLOJİK MUAYENELER

Aydın¹,

Tekin²

1994

Ankara Üniversitesi Veteriner Fakültesi Dergisi

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Patterns of development of gonads, sex-drive and hormonal responses in tropical beef bulls

Cited by 24 publications

References 21 publications

Peri-conception and first trimester diet modifies reproductive development in bulls

Peri-conception and first trimester diet modifies reproductive development in bulls

Subacute ruminal acidosis reduces sperm quality in beef bulls1

DEGİşİK IRKTAN DAMIZLIK BOGALARDA ANDROLOJİK MUAYENELER

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